Material Analysis
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Fast EEA ultraviolet aging
Problem Phenomenon
EEA after 48h of UV irradiation shows mechanical property decline >20%, yellowing
Cause Analysis
EEA molecular chains rapidly degrade by photo-oxidation under UV; surface molecular chains break forming microcracks
Solution
1) Add UV absorber 0.3-0.5wt% to block UV; 2) Add HALS 0.2wt% for radical capture; 3) Carbon black 2wt% for physical UV shielding
Key Takeaway
Fast ultraviolet aging is caused by photo-oxidation; UV absorber and HALS are key
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